Concentrate and degrade PFOA with a photo-regenerable composite of In-doped TNTs@AC

Juve, Jan-Max Arana; Li, Fan; Zhu, Yangmo; Li, Wen; Ottosen, Lars Ditlev Mørck; Wei, Zongsu

doi:10.1016/j.chemosphere.2022.134495

Cited by 18 publications

(3 citation statements)

References 58 publications

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“…The presence of a critical dopant concentration has been extensively supported in the literature, both for gallium [95] and for other dopant ions including iron [79d] and indium. [96] Similar results were obtained also for the codoping of TiO 2 with Fe and Nb ions. [90] The dopants were found to enhance surface area, crystallite size, VIS light absorption, and prevent the transformation of anatase to rutile compared to the pristine oxide.…”

Section: Doped Metal Oxidesupporting

confidence: 73%

Exploring Solar Energy Solutions for Per‐ and Polyfluoroalkyl Substances Degradation: Advancements and Future Directions in Photocatalytic Processes

Bertucci,

Lova

2024

Solar RRL

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Concerns about per‐ and polyfluoroalkyl substances (PFAS) pollution are escalating globally due to the discovery of their widespread environmental distribution, accompanied by their migration, bioaccumulation, and toxic potential for plants, animals, and humans. Several technologies have been developed for their remediation since standard water treatment methods often fail. However, these approaches require large energy consumption and, at times, exacerbate environmental issues. In this context, photocatalytic degradation holds promise as a reliable technological solution for PFAS mineralization. However, to date, it primarily relies on the degradation of perfluorooctanoic acid using high energy gap semiconductor oxides that necessitate high‐power artificial ultraviolet sources for excitation and, at times, the use of strong chemical oxidants. This review examines chemical‐free catalysts and mechanisms recently documented in the literature to outline a roadmap for the realization of solar‐driven mineralization of all PFAS compounds. To this end, we delve into conventional wide bandgap semiconductor oxide and explore strategies to extend their spectral absorbance while enhancing charge separation with a focus on the proposed degradation pathways, that are fundamental to designing technologically relevant photodegradation systems.This article is protected by copyright. All rights reserved.

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Section: Doped Metal Oxidesupporting

confidence: 73%

Exploring Solar Energy Solutions for Per‐ and Polyfluoroalkyl Substances Degradation: Advancements and Future Directions in Photocatalytic Processes

Bertucci,

Lova

2024

Solar RRL

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“…However, such catalysts usually possess relatively low adsorption capability to PFOA, which limits their application in real water treatment. One of the few known adsorptive photocatalysts is a composite with activated carbon-supported indium-doped titanate nanotubes (In/TNT@AC) recently developed by Arana Juve et al 21 for PFOA photodegradation. The composite material shows good adsorption (>99% in 30 min) and photodegradation (>99% in 4 h) performance to PFOA under optimized conditions (0.1 mg L −1 PFOA, 1 g L −1 catalyst, UV−C).…”

Section: Introductionmentioning

confidence: 99%

A Deep Insight into Perfluorooctanoic Acid Photodegradation Using Metal Ion-Exchanged Zeolites

Qian,

Zhao,

Schierz

et al. 2024

ACS EST Eng.

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Treating perfluorooctanoic acid (PFOA) in an aqueous environment is problematic due to its low concentration and its high resistance to biological and chemical degradation. To tackle this challenge, combinations of pre-enrichment and photodegradation processes are promising solutions. In this work, we investigated metal ion-exchanged zeolites as adsorbents and photocatalysts for PFOA treatment. Among various transition metal ion-exchanged BEA zeolites, Fe-exchanged BEA (Fe-BEA) zeolites showed significant activity for the photodegradation of PFOA. The isolated iron species in Fe-BEA zeolite are responsible for PFOA photodegradation, whereas other iron species present from excess iron loading in the zeolite will lower its photocatalytic activity. Furthermore, it was proved via size exclusion tests using branched PFOA isomers that the photodegradation of PFOA took place on the internal surface rather than the external surface of Fe-BEA zeolite. Photodegradation of PFOA was also tested to be effective with Fe-exchanged BEA-type zeolites having various SiO 2 /Al 2 O 3 ratios, but ineffective with FAU-type zeolites. The optimal Fe-BEA zeolite showed a sorption coefficient K d of 6.0 × 10 5 L kg −1 at an aqueous phase PFOA concentration of 0.7 μg L −1 and a PFOA half-life of 1.8 h under UV-A irradiation. The presented study offers a deeper understanding of the use of metal ion-exchanged zeolites for photodegradation of PFOA.

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“…Subsequently, it was successfully degraded over 90% of the preconcentrated PFOA on the solid within 4 h under UV irradiation. In another study, where indium (In) was doped on AC-supported titanate nanotubes followed by photocatalytic oxidative destruction, excellent PFOA adsorption (>99% in 30 min) and photodegradation (>99% in 4 h) were achieved under optimal conditions [48]. This adsorbent demonstrated the ability to be repeatedly used in four consecutive adsorption-photodegradation cycles.…”

mentioning

confidence: 99%

Treatment Trends and Hybrid Methods for the Removal of Poly- and Perfluoroalkyl Substances from Water—A Review

Loganathan,

Kandasamy,

Ratnaweera

et al. 2024

Applied Sciences

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Poly- and perfluoroalkyl substances (PFASs) encompass a diverse group of engineered chemicals extensively manufactured and utilized in various facets of human life. They exhibit widespread distribution in aquatic environments due to their prevalent usage and resistance to degradation. Recognized for their toxicity to both humans and animals and a major public health concern, various techniques have been employed to eliminate them from water sources. However, these methods have shown limitations in efficiently and cost-effectively removing PFASs, particularly in the presence of other water contaminants, which are often present at much higher concentrations than PFASs. This review critically discusses these methods, presenting their respective advantages and limitations. This review illustrates that, rather than solely depending on individual methods as often presented in previous reviews, a combination of techniques has shown greater effectiveness in PFAS removal, owing to their synergistic effects. Hybrid methods capable of practical integration for efficient PFAS removal include adsorption coupled with oxidation, membrane separation combined with oxidation, and the integration of adsorption with membrane separation and incineration. In these hybrid approaches, one technique extracts PFASs from contaminated water and concentrates them, while the other degrades the extracted PFASs. The review presents strategies to enhance the performance of these hybrid methods.

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Concentrate and degrade PFOA with a photo-regenerable composite of In-doped TNTs@AC

Cited by 18 publications

References 58 publications

Exploring Solar Energy Solutions for Per‐ and Polyfluoroalkyl Substances Degradation: Advancements and Future Directions in Photocatalytic Processes

Exploring Solar Energy Solutions for Per‐ and Polyfluoroalkyl Substances Degradation: Advancements and Future Directions in Photocatalytic Processes

A Deep Insight into Perfluorooctanoic Acid Photodegradation Using Metal Ion-Exchanged Zeolites

Treatment Trends and Hybrid Methods for the Removal of Poly- and Perfluoroalkyl Substances from Water—A Review

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